WO2021143744A1 - 多联机空调系统的控制方法 - Google Patents

多联机空调系统的控制方法 Download PDF

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Publication number
WO2021143744A1
WO2021143744A1 PCT/CN2021/071636 CN2021071636W WO2021143744A1 WO 2021143744 A1 WO2021143744 A1 WO 2021143744A1 CN 2021071636 W CN2021071636 W CN 2021071636W WO 2021143744 A1 WO2021143744 A1 WO 2021143744A1
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Prior art keywords
valve
refrigerant
electronic expansion
expansion valve
indoor unit
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PCT/CN2021/071636
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English (en)
French (fr)
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崔国栋
褚运通
王海胜
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青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2021143744A1 publication Critical patent/WO2021143744A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F24F2013/247—Active noise-suppression

Definitions

  • the invention belongs to the technical field of multi-line air conditioning, and specifically provides a control method of a multi-line air conditioning system.
  • Multi-line air conditioning systems are currently commonly used equipment capable of cooling/heating indoors, and are widely used in office buildings, shopping malls, and so on.
  • the refrigerant In the indoor unit cooling, heating and heating standby, the refrigerant will produce sound due to the throttling effect when the refrigerant passes through the electronic expansion valve. This sound will cause trouble to users, especially users who are very sensitive to sound.
  • the capillary tube In the prior art, the capillary tube is usually installed before or after the valve of the electronic expansion valve (both relative to the flow direction of the refrigerant during cooling of the indoor unit). However, the capillary tube is installed in the indoor unit before the valve of the electronic expansion valve. During refrigeration, it will cause the refrigerant to vaporize, increase the dryness of the refrigerant, and cause the state of the refrigerant to be unstable.
  • the present invention provides a control method of the multi-connected air-conditioning system.
  • the air-conditioning system includes an outdoor unit, multiple connecting pipes and multiple indoor units.
  • the connecting pipes correspond to the indoor units one-to-one.
  • Each indoor unit is connected to the outdoor unit through a connecting pipe, and each connecting pipe is installed
  • the throttling element and the on-off valve are arranged in parallel.
  • the throttling element and the on-off valve are arranged on the downstream side of the first electronic expansion valve along the refrigerant flow direction when the indoor unit is cooled.
  • the method includes: determining the operating status of the indoor unit; according to the operating status of the indoor unit, selectively opening or closing the on-off valve, so that the first electronic expansion valve alone throttles the refrigerant, or the throttle element and the first electronic expand The valve throttles the refrigerant in different order.
  • the on-off valve is selectively opened or closed according to the operating state of the indoor unit, so that the first electronic expansion valve can throttle the refrigerant alone, or the throttle element and the first electronic
  • the step of "expansion valve throttling the refrigerant in different order” specifically includes: when the indoor mechanism is hot, the on-off valve is opened to allow the first electronic expansion valve to throttling the refrigerant alone.
  • the on-off valve is selectively opened or closed according to the operating state of the indoor unit, so that the first electronic expansion valve can throttle the refrigerant alone, or the throttle element and the first electronic
  • the step of "expansion valve sequentially throttling the refrigerant in different order” specifically includes: when the indoor unit is cooling, closing the on-off valve so that the first electronic expansion valve and the throttling element successively throttling the refrigerant.
  • the on-off valve is selectively opened or closed according to the operating state of the indoor unit, so that the first electronic expansion valve can throttle the refrigerant alone, or the throttle element and the first electronic
  • the step of "expansion valve throttling the refrigerant in different order” specifically includes: when the indoor mechanism is in hot standby, closing the on-off valve so that the throttling element and the first electronic expansion valve throttling the refrigerant successively.
  • the throttling element is a capillary tube.
  • the throttling element is a second electronic expansion valve.
  • the on-off valve is a solenoid valve.
  • a throttling element, an on-off valve and a first electronic expansion valve are arranged on each connecting pipe, and the throttling element and the on-off valve are arranged in parallel,
  • the throttle element and the on-off valve are arranged on the downstream side of the first electronic expansion valve along the refrigerant flow direction during the cooling of the indoor unit.
  • the switch valve on the connecting pipe corresponding to the indoor unit is closed, so that the refrigerant passes through the first electronic expansion valve and then the throttling element, which can make the first electronic expansion
  • the pressure difference between the front and rear of the valve is reduced, reducing the throttling sound, and will not affect the cooling effect of the indoor unit;
  • the on-off valve on the connecting pipe corresponding to the indoor unit is opened, so that the refrigerant passes through the first electronic
  • the expansion valve then passes through the switch valve, that is, the first electronic expansion valve is used to throttle the refrigerant alone to avoid affecting the heating effect of the indoor unit;
  • the switch valve on the connecting pipe of the indoor unit is closed , So that the refrigerant passes through the throttling element and then the first electronic expansion valve.
  • the throttling element can make the pressure difference between the front and back of the first electronic expansion valve smaller and reduce the throttling sound. That is to say, when the indoor unit is cooling, the throttling element and the first electronic expansion valve perform two-stage throttling to reduce the sound of refrigerant throttling.
  • the capillary tube is arranged on the upstream side of the electronic expansion valve.
  • the throttling element on the downstream side of the electronic expansion valve can avoid the problem of instability of the refrigerant state caused by the vaporization of the refrigerant; when the indoor mechanism is hot, the first electronic expansion valve performs single-stage throttling to avoid affecting the heating of the indoor unit Effect: The throttling element and the first electronic expansion valve perform two-stage throttling when the indoor mechanism is in hot standby, reducing the sound of refrigerant throttling.
  • Figure 1 is a schematic diagram of the structure of the multi-connected air conditioning system of the present invention.
  • Fig. 2 is a flowchart of an embodiment of a control method of a multi-connected air-conditioning system of the present invention.
  • the present invention provides a control method of the multi-line air conditioning system, which aims to take into account the cooling capacity of the indoor unit, and
  • the thermal capacity and the problem of reducing the sound of the refrigerant can meet the needs of users in many aspects to the greatest extent and improve the user experience.
  • the multi-line air conditioning system of the present invention includes an outdoor unit (not shown in the figure), a plurality of connecting pipes 1 and a plurality of indoor units 2 (only one of the connecting pipes and one indoor unit are shown in the figure).
  • the connecting pipe 1 corresponds to the indoor unit 2.
  • Each indoor unit 2 is connected to the outdoor unit through a connecting pipe 1.
  • Each connecting pipe 1 is provided with a throttling element, an on-off valve and a first An electronic expansion valve 3, the throttle element and the switch valve are arranged in parallel, and the throttle element and the switch valve are arranged on the downstream side of the first electronic expansion valve 3 along the refrigerant flow direction when the indoor unit 2 is cooling.
  • the liquid refrigerant flows from the outdoor unit to the indoor unit 2 through the connecting pipe 1, that is, when the on-off valve is opened, the liquid refrigerant first passes through the first electronic expansion valve 3 and then through the on-off valve
  • the throttling element can be a capillary 4, or a second electronic expansion valve, or other elements that can achieve throttling.
  • the throttling element is most preferably the capillary 4, so that the throttling element
  • the cost is lower;
  • the on-off valve can be a solenoid valve 5, of course, it can also be other valves that can realize the on-off function, as long as the on-off valve can realize the on-off of the branch.
  • the control method of the present invention includes: determining the operating state of the indoor unit 2; according to the operating state of the indoor unit 2, selectively opening or closing the on-off valve, so that the first electronic expansion valve 3 throttles the refrigerant alone, or makes the The flow element and the first electronic expansion valve 3 sequentially throttle the refrigerant in different sequences.
  • the throttling element and the first electronic expansion valve 3 throttling the refrigerant in different order means that when the on-off valve is closed and the refrigerant is flowing, it will definitely pass through one of the throttling element and the first electronic expansion valve 3 first. , And then pass through the other of the throttling element and the first electronic expansion valve 3.
  • the refrigerant when the indoor unit 2 is cooling, if the on-off valve is closed, the refrigerant will first pass through the first electronic expansion valve 3 and then through the throttling element. 2 When heating or heating standby, if the on-off valve is closed, the refrigerant will pass through the throttling element and then the first electronic expansion valve 3.
  • the on-off valve is selectively opened or closed, so that the first electronic expansion valve 3 throttles the refrigerant alone, or the throttle element and the first electronic expansion valve 3 are different
  • the step of "throttling the refrigerant in sequence” specifically includes: when the indoor unit 2 is heating, opening the on-off valve to allow the first electronic expansion valve 3 to throttling the refrigerant alone.
  • the on-off valve is opened, because the on-off valve is set in parallel with the throttling element, all or most of the refrigerant will pass through the on-off valve. Very little or no refrigerant passes through the throttling element.
  • the on-off valve is selectively opened or closed, so that the first electronic expansion valve 3 throttles the refrigerant alone, or the throttle element and the first electronic expansion valve 3 are different
  • the step of "throttling the refrigerant in sequence” specifically includes: when the indoor unit 2 is cooling, the on-off valve is closed so that the first electronic expansion valve 3 and the throttling element successively throttling the refrigerant.
  • the on-off valve is closed, because the on-off valve and the throttling element are arranged in parallel, the refrigerant cannot pass through the on-off valve at this time.
  • All the refrigerant first passes through the first electronic expansion valve 3 and then the throttling element, thereby performing two-stage throttling on the refrigerant.
  • the pressure difference between the front and rear of an electronic expansion valve 3 becomes smaller, and the sound of the refrigerant throttling is reduced.
  • the on-off valve is selectively opened or closed, so that the first electronic expansion valve 3 throttles the refrigerant alone, or the throttle element and the first electronic expansion valve 3 are different
  • the step of "throttling the refrigerant in sequence” specifically includes: when the indoor unit 2 is heating and standby, closing the on-off valve so that the throttling element and the first electronic expansion valve 3 throttling the refrigerant in sequence.
  • the on-off valve is closed, because the on-off valve and the throttling element are arranged in parallel, the refrigerant cannot pass through the on-off valve at this time.
  • All the refrigerant first passes through the throttling element and then the first electronic expansion valve 3, thereby performing two-stage throttling of the refrigerant.
  • the pressure difference between the front and rear of an electronic expansion valve 3 becomes smaller, and the sound of the refrigerant throttling is reduced.
  • the throttling element is a capillary tube 4
  • the on-off valve is a solenoid valve 5.
  • control method of the present invention includes:

Abstract

一种多联机空调系统的控制方法，系统包括室外机、多个连机管（1）和多个室内机（2），每个连机管（1）上均设置有节流元件（4）、开关阀（5）和第一电子膨胀阀（3），节流元件（4）与开关阀（5）并联设置，节流元件（4）和开关阀（5）沿室内机（2）制冷时的冷媒流动方向设置在第一电子膨胀阀（3）的下游侧，方法包括：确定室内机（2）的运行状态；根据室内机（2）的运行状态，选择性地使开关阀（5）打开或关闭，以使第一电子膨胀阀（3）单独对冷媒进行节流，或者使节流元件（4）和第一电子膨胀阀（3）按不同顺序先后对冷媒进行节流。该控制方法能够兼顾室内机（2）的制冷、制热能力以及降低冷媒声音的问题，提升用户体验。

Description

多联机空调系统的控制方法 技术领域
本发明属于多联机空调技术领域，具体提供一种多联机空调系统的控制方法。
背景技术
多联机空调系统是目前常用的能够为室内制冷/制热的设备，其广泛地应用于写字楼、购物中心等。
在室内机制冷、制热以及制热待机时，冷媒经过电子膨胀阀时由于节流作用会产生声音，这种声音会对用户造成困扰，尤其是对声音非常敏感的用户。现有技术中，通常是采用在电子膨胀阀的阀前或阀后(均相对于沿室内机制冷时的冷媒流向而言)设置毛细管，然而，在电子膨胀阀的阀前设置毛细管在室内机制冷时会导致冷媒气化，提高冷媒干度，引起冷媒状态不稳定，在电子膨胀阀的阀后设置毛细管在室内机制热时会导致换热器整体阻力加大，降低制热能力。因此，上述在电子膨胀阀的阀前或阀后设置毛细管的方式无法兼顾制冷能力、制热能力以及降低冷媒声音的问题。
因此，本领域需要一种新的多联机空调系统的控制方法来解决上述问题。
发明内容
为了解决现有技术中的上述问题，即为了解决现有多联机空调系统无法兼顾制冷能力、制热能力以及降低冷媒声音的问题，本发明提供了一种多联机空调系统的控制方法，多联机空调系统包括室外机、多个连机管和多个室内机，连机管与室内机一一对应，每个室内机均通过一个连机管与室外机连接，每个连机管上均设置有节流元件、开关阀和第一电子膨胀阀，节流元件与开关阀并联设置，节流元件和开关阀沿室内机制冷时的冷媒流动方向设置在第一电子膨胀阀的下游侧，控制方法包括：确定室内机的运行状态；根据室内机的运行状态，选择性地使 开关阀打开或关闭，以使第一电子膨胀阀单独对冷媒进行节流，或者使节流元件和第一电子膨胀阀按不同顺序先后对冷媒进行节流。
在上述控制方法的优选技术方案中，“根据室内机的运行状态，选择性地使开关阀打开或关闭，以使第一电子膨胀阀单独对冷媒进行节流，或者使节流元件和第一电子膨胀阀按不同顺序先后对冷媒进行节流”的步骤具体包括：当室内机制热时，使开关阀打开以使第一电子膨胀阀单独对冷媒进行节流。
在上述控制方法的优选技术方案中，“根据室内机的运行状态，选择性地使开关阀打开或关闭，以使第一电子膨胀阀单独对冷媒进行节流，或者使节流元件和第一电子膨胀阀按不同顺序先后对冷媒进行节流”的步骤具体包括：当室内机制冷时，使开关阀关闭以使第一电子膨胀阀和节流元件先后对冷媒进行节流。
在上述控制方法的优选技术方案中，“根据室内机的运行状态，选择性地使开关阀打开或关闭，以使第一电子膨胀阀单独对冷媒进行节流，或者使节流元件和第一电子膨胀阀按不同顺序先后对冷媒进行节流”的步骤具体包括：当室内机制热待机时，使开关阀关闭以使节流元件和第一电子膨胀阀先后对冷媒进行节流。
在上述控制方法的优选技术方案中，节流元件为毛细管。
在上述控制方法的优选技术方案中，节流元件为第二电子膨胀阀。
在上述控制方法的优选技术方案中，开关阀为电磁阀。
本领域技术人员能够理解的是，在本发明的优选技术方案中，在每个连机管上都设置节流元件、开关阀和第一电子膨胀阀，且节流元件与开关阀并联设置，并且节流元件和开关阀沿室内机制冷时的冷媒流动方向设置在第一电子膨胀阀的下游侧。通过这样的设置，使得在室内机制冷时，对应该室内机的连机管上的开关阀关闭，使得冷媒先经过第一电子膨胀阀再经过节流元件，节流元件可以使得第一电子膨胀阀的前后压差变小，降低节流声音，且不会影响室内机的制冷效果；在室内机制热时，对应该室内机的连机管上的开关阀打开，使得冷媒先经过第一电子膨胀阀再经过开关阀，即通过第一电子膨胀阀单独对冷媒进行节流，避免影响室内机的制热效果；在室内机制热待机时，对应该室内 机的连机管上的开关阀关闭，使得冷媒先经过节流元件再经过第一电子膨胀阀，节流元件可以使得第一电子膨胀阀的前后压差变小，降低节流声音。也就是说，在室内机制冷时节流元件和第一电子膨胀阀进行双级节流，降低冷媒节流的声音，且相比于现有技术将毛细管设置在电子膨胀阀的上游侧，本发明将节流元件设置在电子膨胀阀的下游侧能够避免冷媒气化而引起的冷媒状态不稳定的问题；在室内机制热时第一电子膨胀阀进行单级节流能够避免影响室内机的制热效果；在室内机制热待机时节流元件和第一电子膨胀阀进行双级节流，降低冷媒节流的声音。通过这样的控制方式，能够兼顾室内机的制冷能力，制热能力以及降低冷媒声音的问题，做到最大程度上满足用户多方面的实际使用需求，提升用户体验。
附图说明
图1是本发明的多联机空调系统的结构示意图；
图2是本发明的多联机空调系统的控制方法实施例的流程图。
具体实施方式
下面参照附图来描述本发明的优选实施方式。本领域技术人员应当理解的是，这些实施方式仅仅用于解释本发明的技术原理，并非旨在限制本发明的保护范围。
需要说明的是，在本发明的描述中，术语“上”、“下”等指示的方向或位置关系的术语是基于附图所示的方向或位置关系，这仅仅是为了便于描述，而不是指示或暗示所述装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。
基于背景技术指出的现有多联机空调系统无法兼顾制冷能力、制热能力以及降低冷媒声音的问题，本发明提供了一种多联机空调系统的控制方法，旨在兼顾室内机的制冷能力，制热能力以及降低冷媒 声音的问题，做到最大程度上满足用户多方面的实际使用需求，提升用户体验。
如图1所示，本发明的多联机空调系统包括室外机(图中未示出)、多个连机管1和多个室内机2(图中仅示出其中一个连机管和一个室内机)，连机管1与室内机2一一对应，每个室内机2均通过一个连机管1与室外机连接，每个连机管1上均设置有节流元件、开关阀和第一电子膨胀阀3，节流元件与开关阀并联设置，节流元件和开关阀沿室内机2制冷时的冷媒流动方向设置在第一电子膨胀阀3的下游侧。其中，在室内机2对室内进行制冷时，液态冷媒经过该连机管1从室外机流向该室内机2，即在开关阀打开时，液态冷媒先经过第一电子膨胀阀3再经过开关阀，在开关阀关闭时，液态冷媒先经过第一电子膨胀阀3再经过节流元件。在本发明中，节流元件可以为毛细管4，也可以为第二电子膨胀阀，还可以为其他能够实现节流作用的元件，当然，节流元件最优选为毛细管4，从而使节流元件的成本更低；开关阀可以为电磁阀5，当然，还可以为其他能够实现开关作用的阀门，只要通过该开关阀能够实现该支路的通断即可。
本发明的控制方法包括：确定室内机2的运行状态；根据室内机2的运行状态，选择性地使开关阀打开或关闭，以使第一电子膨胀阀3单独对冷媒进行节流，或者使节流元件和第一电子膨胀阀3按不同顺序先后对冷媒进行节流。其中，节流元件和第一电子膨胀阀3按不同顺序先后对冷媒进行节流是指当开关阀关闭且冷媒在流动时，肯定会先经过节流元件和第一电子膨胀阀3中的一个，再经过节流元件和第一电子膨胀阀3的另一个，例如当室内机2制冷时，如果将开关阀关闭，冷媒会先经过第一电子膨胀阀3再经过节流元件，当室内机2制热或制热待机时，如果将开关阀关闭，冷媒会先经过节流元件再经过第一电子膨胀阀3。
优选地，“根据室内机2的运行状态，选择性地使开关阀打开或关闭，以使第一电子膨胀阀3单独对冷媒进行节流，或者使节流元件和第一电子膨胀阀3按不同顺序先后对冷媒进行节流”的步骤具体包括：当室内机2制热时，使开关阀打开以使第一电子膨胀阀3单独对冷媒进行节流。当开关阀打开时，由于开关阀与节流元件并联设置，此时 全部冷媒或者大部分冷媒会从开关阀通过，极少量冷媒或没有冷媒从节流元件通过，需要说明的是，当冷媒压力较高时，会有极少量冷媒通过节流元件，但是由于冷媒量较少会很顺利通过节流元件，即节流元件无法对冷媒进行节流，也就是说，此时仅有第一电子膨胀阀3对冷媒进行节流，从而保证室内机2的制热效果不受影响。
优选地，“根据室内机2的运行状态，选择性地使开关阀打开或关闭，以使第一电子膨胀阀3单独对冷媒进行节流，或者使节流元件和第一电子膨胀阀3按不同顺序先后对冷媒进行节流”的步骤具体包括：当室内机2制冷时，使开关阀关闭以使第一电子膨胀阀3和节流元件先后对冷媒进行节流。当开关阀关闭时，由于开关阀与节流元件并联设置，此时冷媒无法通过开关阀，全部冷媒先经过第一电子膨胀阀3再经过节流元件，从而对冷媒进行双级节流，第一电子膨胀阀3的前后压差变小，冷媒节流声音减小。
优选地，“根据室内机2的运行状态，选择性地使开关阀打开或关闭，以使第一电子膨胀阀3单独对冷媒进行节流，或者使节流元件和第一电子膨胀阀3按不同顺序先后对冷媒进行节流”的步骤具体包括：当室内机2制热待机时，使开关阀关闭以使节流元件和第一电子膨胀阀3先后对冷媒进行节流。当开关阀关闭时，由于开关阀与节流元件并联设置，此时冷媒无法通过开关阀，全部冷媒先经过节流元件再经过第一电子膨胀阀3，从而对冷媒进行双级节流，第一电子膨胀阀3的前后压差变小，冷媒节流声音减小。
下面结合一个具体的实施例来阐述本发明的最优选实施方式。其中，节流元件为毛细管4，开关阀为电磁阀5。
如图2所示，本发明的控制方法包括：
S1：确认室内机2的运行状态；
S2：如果室内机2的运行状态为制冷状态，则使电磁阀5关闭以使第一电子膨胀阀3和毛细管4先后对冷媒进行节流；
S3：如果室内机2的运行状态为制热状态，则使电磁阀5打开以使第一电子膨胀阀3单独对冷媒进行节流；
S4：如果室内机2的运行状态为制热待机状态，则使电磁阀5关闭以使毛细管4和第一电子膨胀阀3先后对冷媒进行节流。
至此，已经结合附图所示的优选实施方式描述了本发明的技术方案，但是，本领域技术人员容易理解的是，本发明的保护范围显然不局限于这些具体实施方式。在不偏离本发明的原理的前提下，本领域技术人员可以对相关技术特征作出等同的更改或替换，这些更改或替换之后的技术方案都将落入本发明的保护范围之内。

Claims (7)

  1. 一种多联机空调系统的控制方法，其特征在于，所述多联机空调系统包括室外机、多个连机管和多个室内机，所述连机管与所述室内机一一对应，每个所述室内机均通过一个所述连机管与所述室外机连接，
    每个所述连机管上均设置有节流元件、开关阀和第一电子膨胀阀，所述节流元件与所述开关阀并联设置，所述节流元件和所述开关阀沿所述室内机制冷时的冷媒流动方向设置在所述第一电子膨胀阀的下游侧，
    所述控制方法包括：
    确定所述室内机的运行状态；
    根据所述室内机的运行状态，选择性地使所述开关阀打开或关闭，以使所述第一电子膨胀阀单独对冷媒进行节流，或者使所述节流元件和所述第一电子膨胀阀按不同顺序先后对冷媒进行节流。
  2. 根据权利要求1所述的控制方法，其特征在于，“根据所述室内机的运行状态，选择性地使所述开关阀打开或关闭，以使所述第一电子膨胀阀单独对冷媒进行节流，或者使所述节流元件和所述第一电子膨胀阀按不同顺序先后对冷媒进行节流”的步骤具体包括：
    当所述室内机制热时，使所述开关阀打开以使所述第一电子膨胀阀单独对冷媒进行节流。
  3. 根据权利要求1所述的控制方法，其特征在于，“根据所述室内机的运行状态，选择性地使所述开关阀打开或关闭，以使所述第一电子膨胀阀单独对冷媒进行节流，或者使所述节流元件和所述第一电子膨胀阀按不同顺序先后对冷媒进行节流”的步骤具体包括：
    当所述室内机制冷时，使所述开关阀关闭以使所述第一电子膨胀阀和所述节流元件先后对冷媒进行节流。
  4. 根据权利要求1所述的控制方法，其特征在于，“根据所述室内机的运行状态，选择性地使所述开关阀打开或关闭，以使所述第一电子膨胀阀单独对冷媒进行节流，或者使所述节流元件和所述第一电子膨胀 阀按不同顺序先后对冷媒进行节流”的步骤具体包括：
    当所述室内机制热待机时，使所述开关阀关闭以使所述节流元件和所述第一电子膨胀阀先后对冷媒进行节流。
  5. 根据权利要求1所述的控制方法，其特征在于，所述节流元件为毛细管。
  6. 根据权利要求1所述的控制方法，其特征在于，所述节流元件为第二电子膨胀阀。
  7. 根据权利要求1至6中任一项所述的控制方法，其特征在于，所述开关阀为电磁阀。
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